Abstract：On the basis of the Bouguer gravity anomaly data of EIGEN-6C4 model, V19.1 terrain data and CRUST1.0 model crustal data, we calculate the effective elastic thickness (Te) of lithosphere in north China by the joint inversion method of admittance and correlation function methods. The results show that the Te value in north China has obvious lateral inhomogeneity. The Ordos block is a high value area, and the Te is about 30-60 km. The north China plain is a low value area, and the Te is about 5-25 km. The Ludong-Huanghai block is a middle and high value area, and the Te is about 20-50 km. The high Te value area of the north China Craton corresponds to the stable Ordos block, and the middle and low Te values correspond to the relatively active Taihang mountain tectonic belt and Tanlu fault zone. From the relationship between Te value and surface heat flow, the area with high Te value generally corresponds to the area with low heat flow value, while the area with low Te value generally has high heat flow value, which is consistent with the general distribution law of lithospheric thickness and surface heat flow. According to Te and the spatial distribution of earthquakes, the seismic activity in north China is mainly concentrated in the middle and low value areas of Te, indicating that the area with smaller Te has poor stability and may be more conducive to the preparation and occurrence of earthquakes.
SUN Wenkui,TANG Xingong. The Effective Elastic Thickness of the Lithosphere in North China and Its Geodynamic Significance[J]. jgg, 2023, 43(9): 936-944.
